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Thread: Bad Power Supply?




  1. #1
    Join Date
    Dec 2009
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    PA
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    Default Bad Power Supply?

    I downloaded, installed and ran Speedfan to check the voltages of my power supply. See the attached image for the screenshot. I am suspecting that my + and - 12V and my + and - 5V should be telling me that my power supply is bad.

    I am also getting random computer shut downs (just completely turns off) while doing anything on the computer from browsing the internet to playing a game. It happens even when I am not using the computer and it occurs every few hours.

    The power supply in question is a KINGWIN Mach 1 ABT-1220MA1S 1220W

    Think my power supply is bad?

    Core i7 920 Bloomfield @ 2.66Ghz | Gigabyte GA-EX58-UD3R Rev 1.0 - Bios F8I | Nvidia GTX 295 Video Card | OCZ Reaper HPC 6GB (3x2GB) DDR3 1866 PC3 1500 | KINGWIN Mach 1 ABT-1220MA1S 1220W | Western Digital VelociRaptor - 150GB 10,000RPM 16MB Cache SATA 3.0GB/s [WD1500HLFS] | 2x Western Digital Caviar Black - 1TB 7200RPM 32MB Cache SATA 3.0Gb/s [WD1001FALS] | WesternDigital Caviar SE16 - 750GB 7200RPM 16MB Cache SATA 3.0Gb/s [WD7500AAKS] | Western Digital Cavier Blue - 500GB 7200RPM 16MB Cache SATA 3.0Gb/s [WD5000AAKS] |Razer Lycosa/Lachesis | Windows 7 Pro x64

  2. #2
    Join Date
    Jan 2010
    Location
    Zagreb, Croatia
    Posts
    2

    Default Re: Bad Power Supply?

    The sensor is lying big time...nothing unusual. If those readings were correct, the PC wouldn't boot up or/and the MBO would be fryed! For more accurate measurements, use a digital multimeter. Even a cheap one (I bought mine for ~7 US $) will do it much better than the MBO.

    After you get some accurate info on the voltages, we can find out if the PSU causes the system to restart. The PC draws most of the power from the 12V line, so this line is crucial for system stability. According to ATX specification, the voltage may vary +- 5% off the nominal. If the voltage is in range, then you should search for failure cause somewhere else.

    The PSU is likely to fail when under serious load --> in the most cases it fails when gaming, not when surfing the internet. Or it fails at the bootup. What does the Windows Event Log say? Did you try different versions of drivers?
    Last edited by matesonik; 01-17-2010 at 05:48 PM.

  3. #3
    Join Date
    Apr 2009
    Location
    Virginia
    Posts
    1,470

    Default Re: Bad Power Supply?

    I have seen that problem before. It's the speedfan software. Try downloading the HWmonitor from CPUID, and compare. I have provided the link below, and post a img. with it thanks----> CPUID
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
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  4. #4
    Join Date
    Dec 2009
    Location
    PA
    Posts
    10

    Default Re: Bad Power Supply?

    Below is the image from CPUID.

    What info do you want me to post from the Windows Event Viewer?

    Thanks!

    Core i7 920 Bloomfield @ 2.66Ghz | Gigabyte GA-EX58-UD3R Rev 1.0 - Bios F8I | Nvidia GTX 295 Video Card | OCZ Reaper HPC 6GB (3x2GB) DDR3 1866 PC3 1500 | KINGWIN Mach 1 ABT-1220MA1S 1220W | Western Digital VelociRaptor - 150GB 10,000RPM 16MB Cache SATA 3.0GB/s [WD1500HLFS] | 2x Western Digital Caviar Black - 1TB 7200RPM 32MB Cache SATA 3.0Gb/s [WD1001FALS] | WesternDigital Caviar SE16 - 750GB 7200RPM 16MB Cache SATA 3.0Gb/s [WD7500AAKS] | Western Digital Cavier Blue - 500GB 7200RPM 16MB Cache SATA 3.0Gb/s [WD5000AAKS] |Razer Lycosa/Lachesis | Windows 7 Pro x64

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